STM32L152 AD采集问题

jikejie135 提问时间：2013-7-30 10:12 /

[url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/group__ADC1__AnalogWatchdog.html#ga840291bc02cba5474a4cb46a9b9566fe]main[/url](void)
00062 {
00063 /*!< At this stage the microcontroller clock setting is already configured,
00064        this is done through SystemInit() function which is called from startup
00065        file (startup_stm32l1xx_xx.s) before to branch to application main.
00066        To reconfigure the default setting of SystemInit() function, refer to
00067        system_stm32l1xx.c file
00068      */
00069
00070   /* Configure LED1 available on STM32L152X-EVAL board ---------------------- */
00071   [url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/group__STM32L152__EVAL__LOW__LEVEL__Private__Functions.html#ga01e1a245e786705357f741c8d42cbd3a]STM_EVAL_LEDInit[/url]([url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/group__STM32L152D__EVAL__LOW__LEVEL__Exported__Types.html#ggaa059704b7ca945eb9c1e7f2c3d03fecdadac6477842247cab1a8c02c65f431b44]LED1[/url]);
00072
00073 /* Configure PB.12 (ADC1 Channel18) or PF.10 (ADC1 Channel31) in analog mode -*/
00074 GPIO_InitStructure.[url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/structGPIO__InitTypeDef.html#a55bd77e335c2bfeec9caa5dc922b791b]GPIO_Mode[/url] = [url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/group__Configuration__Mode__enumeration.html#gga1347339e1c84a196fabbb31205eec5d4a6e5c0d7e6d2e22b834b24e1ca1d6d0db]GPIO_Mode_AN[/url];
00075 GPIO_InitStructure.[url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/structGPIO__InitTypeDef.html#aad62942c003bc2083d37f10f6f39bd5f]GPIO_PuPd[/url] = [url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/group__Configuration__Pull-Up__Pull-Down__enumeration.html#ggafb7ecd99c44b4fd702d669304a36c2c8a013a40bdeb6b3f43e02f8e4da896ba51]GPIO_PuPd_NOPULL[/url];
00076
00077 #if defined USE_STM32L152D_EVAL
00078 /* Enable the GPIOF Clock */
00079 [url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/group__RCC.html#gae0b30d8598b8393bdba9c3fefba3a968]RCC_AHBPeriphClockCmd[/url]([url=mk

MSITStore:E:\盖特信息\煤矿\水文分站\软件\stsw-stm32077\STM32L1xx_StdPeriph_Lib_V1.2.0\stm32l1xx_stdperiph_lib_um.chm::/group__RCC__AHB__Peripherals.html#ga16d4ffadf5b50e96653c8b426d20cc27]RCC_AHBPeriph_GPIOF[/url], ENABLE);
00080   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
00081   GPIO_Init(GPIOF, &GPIO_InitStructure);
00082 #elif defined USE_STM32L152_EVAL
00083 /* Enable the GPIOB Clock */
00084   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
00085   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
00086   GPIO_Init(GPIOB, &GPIO_InitStructure);
00087 #endif
00088
00089   /* Enable the HSI */
00090   RCC_HSICmd(ENABLE);
00091   /* Wait until HSI oscillator is ready */
00092   while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);
00093
00094   /* Enable ADC1 clock */
00095   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
00096   /* ADC1 Configuration -----------------------------------------------------*/
00097   ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
00098   ADC_InitStructure.ADC_ScanConvMode = ENABLE;
00099   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
00100   ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
00101   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
00102   ADC_InitStructure.ADC_NbrOfConversion = 1;
00103   ADC_Init(ADC1, &ADC_InitStructure);
00104
00105 #if defined USE_STM32L152D_EVAL
00106 /* ADC1 regular channel31 configuration */
00107   ADC_RegularChannelConfig(ADC1, ADC_Channel_31, 1, ADC_SampleTime_16Cycles);
00108 #elif defined USE_STM32L152_EVAL
00109 /* ADC1 regular channel18 configuration */
00110   ADC_RegularChannelConfig(ADC1, ADC_Channel_18, 1, ADC_SampleTime_16Cycles);
00111 #endif
00112
00113
00114   /* Configure high and low analog watchdog thresholds */
00115   ADC_AnalogWatchdogThresholdsConfig(ADC1, 0xE8B, 0x26D);
00116
00117 #if defined USE_STM32L152D_EVAL
00118 /* Configure channel31 as the single analog watchdog guarded channel */
00119   ADC_AnalogWatchdogSingleChannelConfig(ADC1, ADC_Channel_31);
00120   /* Enable analog watchdog on one regular channel: channel31 */
00121   ADC_AnalogWatchdogCmd(ADC1, ADC_AnalogWatchdog_SingleRegEnable);
00122 #elif defined USE_STM32L152_EVAL
00123 /* Configure channel18 as the single analog watchdog guarded channel */
00124   ADC_AnalogWatchdogSingleChannelConfig(ADC1, ADC_Channel_18);
00125   /* Enable analog watchdog on one regular channel: channel18 */
00126   ADC_AnalogWatchdogCmd(ADC1, ADC_AnalogWatchdog_SingleRegEnable);
00127 #endif
00128
00129   /* Configure and enable ADC1 interrupt */
00130   NVIC_InitStructure.NVIC_IRQChannel = ADC1_IRQn;
00131   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
00132   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
00133   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
00134   NVIC_Init(&NVIC_InitStructure);
00135
00136   /* Enable AWD interrupt */
00137   ADC_ITConfig(ADC1, ADC_IT_AWD, ENABLE);
00138
00139   /* Enable ADC1 */
00140   ADC_Cmd(ADC1, ENABLE);
00141
00142   /* Wait until the ADC1 is ready */
00143   while(ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS) == RESET)
00144   {
00145   }
00146
00147   /* Start ADC1 Software Conversion */
00148   ADC_SoftwareStartConv(ADC1);
00149
00150   while (1)
00151   {
00152   }
00153 }

在这个文档中，为何必须使用内部时钟，AD才能运行，如果我使用外部时钟，程序一直运行在while(ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS) == RESET)处，
请指教